Bitcoin mining problem (SOLUTION)

So I mined and got a little, everything good but suddenly since 6/1/13, I left my PC on for 12 hours and gui miner told me I got no shares. I did it again with a diffrent pool (bitcoin pool , the first time it was 50btc) and same thing, is there something wrong with my computer or did something happen to make it really hard to mine. 

 

              P.S. I mine at 100mh/s

 

 EDIT:

I have an AMD 6670, I oppened up a game and it said install drivers, so I went and got the newest catalyst version.  https://bitcointalk.org/index.php?topic=177855.0 This Link really helped me out, although the error that you get lasts for a fraction of a second and I had to record it and watch the clip to read it.

                                        In this case the problem was AMD CATALYST 13.6 BETA so re install an older version.

Most likely there was some kind of connection error to your pool.  Double check your log in info.  If you have typed it in correctly, I would try re-intalling guiminer.

I will re install.